John,
I had similar problems when I first started using PICs. Try
putting a .1 or .01 uF cap by the PIC. Put it at the PICs +5vDC
to the PICs ground. Solved my problem! Hope this helps.

Best regards,
Steven


Steven Kosmerchock
Engineering Technician/Student
CELWAVE
Phoenix   Arizona   USA
Email:   steve.kosmerchock@celwave.com
www.geocities.com/researchtriangle/lab/6584